That is a cleaver idea but is this something that would only increase the life of the engine if you drove it 500,000 miles? What benefits does it have if you only use it 100,000 miles before trading it in?
I don't know.
The magnets cost near nothing.... they are extra left over from a quantity purchase for another project.
The truck has 194,000 miles on it now and doesn't burn a single drop of oil in 10,000 miles.
I'll likely run it another 200,000 miles. (yes, seriously)